三维双极超短电磁脉冲在非均匀碳纳米管阵列中的传输
Propagation of three-dimensional bipolar ultrashort electromagnetic pulses in an inhomogeneous array of carbon nanotubes
摘要：
研究了三维双极超短电磁脉冲在非均匀半导体碳纳米管阵列中的传播。异质性由具有增加的传导电子浓度的平面区域表示。电磁场的演化和样品中的电子浓度由麦克斯韦方程组和连续性方程控制。特别是，考虑到沿纳米管的轴的电磁场的不均匀性。我们证明，根据接近的区域具有较高的电子浓度的电磁脉冲的参数值，脉冲被反射的区域或通过它。具体地说，我们的模拟表明，与高浓度的区域相互作用后，脉冲可以稳定地传播，没有显着的扩展。这种超短电磁脉冲在碳纳米管阵列中传播的距离显著超过脉冲的特征尺寸的可能性使得可以将它们视为3D孤子。
英文摘要：
We study the propagation of three-dimensional (3D) bipolar ultrashort electromagnetic pulses in an inhomogeneous array of semiconductor carbon nanotubes. The heterogeneity is represented by a planar region with an increased concentration of conduction electrons. The evolution of the electromagnetic field and electron concentration in the sample are governed by the Maxwell's equations and continuity equation. In particular, non-uniformity of the electromagnetic field along the axis of the nanotubes is taken into account. We demonstrate that, depending on values of parameters of the electromagnetic pulse approaching the region with the higher electron concentration, the pulse is reflected from the region or passes it. Specifically, our simulations demonstrate that, after interacting with the higher-concentration area, the pulse can propagate steadily, without significant spreading. The possibility of such ultrashort electromagnetic pulses propagating in arrays of carbon nanotubes over distances significantly exceeding characteristic dimensions of the pulses makes it possible to consider them as 3D solitons.
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